JPH0623987A - Ink jetting head - Google Patents

Abstract

PURPOSE:To enable a multi-head to be constituted by a simple structure by making positional precision between an electrostrictive vibrator and a cylindrical tube easy by a method wherein a plurality of cylindrical tubes are arranged at positions receiving pressure action of pressure generating parts formed by attaching an electrode to an electrostrictive vibrator or a magnetostrictive vibrator supported with a pedestal. CONSTITUTION:In order to assemble respective components, a number of glassy cylindrical tubes 5a composing a glass cylindrical tube line 5 are arranged in an adjacent state on a solid structured pedestal 10, and end faces on a front face side of respective cylindrical tubes 5a are so arranged as to be located on a same plane. An electrostrictive vibrator 2 is so arranged as to be put above the cylindrical tubes thus arranged uniform, and fixed lest an immoderate load should be applied. A gap among the vibrator 2, respective cylindrical tubes 5a composing the cylindrical tube line 5, and the pedestal 10 is filled by use of fillers being highly hard or the like around an ink chamber 7 so that the ink chamber 7 is hermetically sealed at that time. Since there is thus no necessity for strict registration of the electrostrictive or magnetostrictive vibrator to the cylindrical tube, assembling precision is not strictly requested and a manufacturing cost can be steeply reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet head for a printer using an on-deman type pressure system,
In particular, the present invention relates to an inkjet head having a structure suitable for a multi-head.

[0002]

2. Description of the Related Art Conventionally, various types of ink jet heads used in on-deman type pressure printers are well known, and some typical ones will be described below. .

(1). Oscillator Cylindrical Type As shown in FIG. 12, the oscillator cylindrical type has a cylindrical electrostrictive element 31 attached to a side surface of a container 30 formed of a glass cylindrical tube or the like, and a voltage from a power supply unit 32 is applied to the electrostrictive element 31. The change in the volume in the ink chamber 30a caused by the application of the ink causes an ink ejection hole (hereinafter referred to as an orifice) 30b.
Is a method of ejecting the ink particles 30c from.

(2). Vibrator Flat Plate The vibrator flat plate type is a box-shaped container 30 as shown in FIG.
An ink chamber 30a is provided inside, and a flat plate type electrostrictive element 33 and a vibrating plate 34 are bonded and formed on the outside of the ink chamber 30a, and a voltage is applied from a power source section 32 to apply a bimorph voltage. Due to the change in volume, the orifice 30
In this method, the ink particles 30c in the ink chamber 30a are ejected from b.

(3). As shown in FIG. 14, in the step type, the box type container 30 is provided with the ink pressure chamber 35 and the ink supply path 36 separately, and the step (3). Similar to the vibrator flat plate type, the flat plate type electrostrictive element 33 and the vibrating plate 34 are bonded to each other to form the power source unit 3.
This is a system in which the volume of the ink pressure chamber 35 is changed by the application of a voltage from 2 to eject the ink particles 30c in the ink supply passage 36 from the orifice 30b.

(4). Heat vaporization type As shown in FIGS. 15 to 18, the heat vaporization type instantaneously vaporizes the ink 38 in the ink chamber 37 with heat energy generated by applying a voltage to the heating element 39 mounted in the ink chamber 37. Then, the ink particles 30c are ejected from the orifice 30b by the volume change of the ink 38 in the ink chamber 37.

[0007]

However, the above-mentioned conventional ink jet head has the following problems. That is, the vibrator cylindrical type of the above (1) uses a cylindrical tube, so that it is difficult to make the head multi, and the vibrator flat plate type of the above (2) has a required area of the electrostrictive element. Since it becomes large, it is difficult to assemble and multi-form the heads. In the step type of (3), the area of the electrostrictive element required is large, and it is difficult to assemble and multi-form the heads. In addition, since the structure is complicated and manufacturing is difficult, the heat vaporization type described in (4) above requires heat-resistant ink because the heat is applied to the ink, and the energy efficiency of the heating element deteriorates. There is a problem that power consumption is high.

Therefore, in the conventional example, the structure is simple,
Moreover, in order to reduce the size and weight of the head, there is a problem that must be solved by assembling a large number of heads and making the heads multi-headed.

[0009]

In order to solve the above-mentioned problems, the present invention provides an electrostrictive oscillator or a magnetostrictive oscillator supported on a pedestal with electrodes to form a pressure generating portion, and the pressure generating portion This is an inkjet head in which a plurality of cylindrical tubes are arranged at positions where pressure is applied, and the pressure generating portion is formed in a comb shape, and one end face group of the plurality of arranged cylindrical tubes is in the same plane. Is arranged in a line, and the other end face group is arranged so as to face the ink chamber.

Further, the material of the electrostrictive oscillator is lead zirconate titanate, the material of the electrostrictive oscillator is barium titanate, and the magnetostrictive oscillator is a layered magnetostrictive oscillator.
A magnetostrictive vibrator is a vibrator produced by compressing and sintering ferrite powder, a cylindrical tube is a glass-like cylindrical tube, a cylindrical tube is a metallic cylindrical tube, and a cylindrical tube is made of resin. The shape of the head is a monochromatic single head, or a multicolor single head, or a multicolor multihead, or the position of the electrode is the position of the electrostrictive oscillator or the magnetostrictive oscillator. Provided on the side surface of the comb tooth portion, or on the side surface of the comb tooth portion of the electrostrictive oscillator or the magnetostrictive oscillator, provided at a position close to the cylindrical tube, and further provided with a protrusion for positioning the cylindrical tube on the pedestal, Sawtooth the place where the cylindrical tube of the pedestal is arranged,
Also, the position of the ink supply path is provided on one of the side plates provided on both sides of the base, the position of the ink supply path is provided on the back surface of the base, or the position of the ink supply path is provided on the lower surface of the base, or electrostrictive vibration is provided. This is an inkjet head in which a child or a magnetostrictive vibrator is provided on both sides of a cylindrical tube.

[0011]

[Function] A plurality of cylindrical tubes are arbitrarily arranged in the pressure generating portion composed of an electrostrictive oscillator or a magnetostrictive oscillator, or a plurality of cylindrical tubes are arbitrarily disposed in the comb tooth portion of the pressure generating portion formed in a comb shape. By providing the structure, it is not necessary to strictly perform the positioning accuracy between the electrostrictive oscillator and the cylindrical tube.

Further, in order to arbitrarily arrange a plurality of cylindrical tubes,
By preparing cylindrical tubes having the same shape, the multi-head can be constructed with a simple structure.

[0013]

EXAMPLE As shown in FIGS. 1 to 3, an ink jet head of a first example according to the present invention comprises an electrostrictive vibrator 2, electrodes 3, 4, a glass cylindrical tube row 5, an orifice 6, and an orifice 6. It is composed of an ink chamber 7, an ink supply passage 8, a side plate 9, and a pedestal 10.

The electrostrictive oscillator 2 is made of a substance that causes an electrostrictive phenomenon, and is made of, for example, lead zirconate titanate (PZT.55).
%, PbZrO3, 45% PbTiO3). The electrostrictive vibrator 2 has a comb-tooth-shaped structure, and the comb-tooth-shaped convex portion, that is, the pressure generating portion 2a and the comb-tooth-shaped gap portion 2b, have a resolution (for example, a resolution) of a printer that employs the head. , 16 dot / mm, 400 dot / i
nch, etc.) is formed at an interval corresponding to the pixel pitch interval.

The electrodes 3 and 4 are positive and negative electrodes arranged at positions where the pressure generating portion 2a causes an electrostrictive phenomenon in the vertical direction except for the gap portion 2b of the electrostrictive oscillator 2, and one electrode Three
Is disposed on the upper surface side of the electrostrictive oscillator 2, and the other electrode 4 is attached to the lower surface side corresponding to the tip end surface portion of the pressure generating portion 2a by plating vapor deposition or pressure bonding.

The glass cylindrical tube row 5 is composed of a plurality of glass-like cylindrical tubes 5a, and the glass-like cylindrical tubes 5a are arranged adjacent to each other so that the side surfaces of the glass-like cylindrical tubes 5a contact or approach each other. The front end surfaces of the tubes 5a are fixed so that they are arranged substantially in a line on the same plane. The rear end surface of the glass cylindrical tube array 5 faces an ink chamber 7 described later,
As a result, the front end face becomes an ink ejection port (hereinafter referred to as an orifice) 6 that ejects ink particles.

The glass-like cylindrical tube 5a is formed of a material having a hardness as high as glass, and its shape has an outer diameter which is a fraction or less of the pixel pitch interval obtained from the resolution required for the printer.

The ink chamber 7 is a chamber for supplying ink to each glass-like cylindrical tube 5a, and the inside of the ink chamber 7 is sealed with a filler or the like to prevent a gap between the ink chamber 7 and each glass-like cylindrical tube 5a. It has a structure. Therefore, the ink inlet is only the ink supply passage 8 and the outlet is only the glass-like cylindrical tube 5a.

The ink supply passage 8 is provided through the side plate 9, and the side plate 9 has a pedestal 10 having a substantially L-shaped cross section.
The ink 7 is attached to the side of the electrostrictive oscillator 2 to establish the ink 7. Then, when ink is supplied from the ink supply passage 8, a pressure is applied to the inside of the ink chamber 7.

The pedestal 10 has a strong structure in which the glass-like cylindrical tubes 5a of the glass cylindrical tube row 5 are fixedly held and further has a groove portion 10a forming a part of the ink chamber 7.

In order to assemble the constituent elements having the above structure, first, a large number of glass-like cylindrical tubes 5a constituting the glass cylindrical tube row 5 are arranged adjacent to each other on the pedestal 10 having a strong structure, and each glass-like cylindrical tube 5a is arranged. The end faces on the front surface side of the cylindrical tube 5a are aligned so as to be located on the same plane.

Glass-like cylindrical tube 5 arranged side by side in this manner
Arranged so that the electrostrictive vibrator 2 is placed on the upper part of a,
Fix it so as not to apply excessive load. At this time, a filler having high hardness is used around the ink chamber 7 so that the ink chamber 7 is hermetically sealed, and the electrostrictive oscillator 2 and the glass cylindrical tube array 5 are used.
The gap between each of the glass-like cylindrical tubes 5a and the pedestal 10 constituting the above is closed. The relative position of the electrostrictive oscillator 2 and the glass cylindrical tube row 5 in the left-right direction, that is, the positional relationship in the horizontal direction does not need to be highly accurate.

Further, between the upper surface of the glass cylindrical tube row 5 and the pressure generating portion 2a of the electrostrictive vibrator 2, the displacement due to the electrostrictive phenomenon of the electrostrictive vibrator 2 in the direction of the arrow causes each glass-like cylindrical tube 5a. It is kept in a state of being closely attached to such an extent that it directly affects and deforms.

If the above state cannot be maintained, that is, if there is a gap between the upper surface of each glass-like cylindrical tube 5a and the tip end surface of the pressure generating portion 2a between the electrostrictive vibrator 2 and the electrostrictive vibrator 2, the gap is set. It is necessary to fill the inside with a filler having high hardness so that the displacement of the electrostrictive oscillator 2 due to the electrostrictive phenomenon can be directly transmitted to each glass-like cylindrical tube 5a constituting the glass cylindrical tube row 5. .

Next, two side plates 9 (one of which is not shown) are attached to the left and right sides of the ink chamber 7 in close contact with each other so as to maintain the airtightness of the ink chamber 7. Alternatively, the side plates 9 may be first attached to both side surfaces of the pedestal 10 to form the whole into a box shape, and the glass-like cylindrical tubes 5a may be arranged inside thereof to mount the electrostrictive vibrator 2.

In the ink jet head thus assembled, no printing ink is left from the ink supply passage 8 inside the ink chamber 7 and inside each glass-like cylindrical tube 5a forming the glass cylindrical tube row 5. To fill up.

When the timing for printing is generated, the electrodes 3 and 4 provided on the upper and lower surfaces of the electrostrictive vibrator 2 will be described.
Is supplied with a voltage sufficient to selectively cause the electrostriction phenomenon. The electrostrictive phenomenon generated by supplying the voltage in this way causes the pressure generating portion 2a of the electrostrictive vibrator 2 to be displaced so as to increase in the vertical direction (electrode direction).

Therefore, due to this electrostriction phenomenon, the glass-like shape of the glass cylindrical tube row 5 which is in close contact with the top surface of the corresponding pressure generating portion 2a of the electrostrictive vibrator 2 or in close contact with the cured filler is used. The cylindrical tube 5a is deformed, and the glass-like cylindrical tube 5a which is in contact with each other is also deformed. As a result, the glass-like cylindrical tube 5a is deformed.
The internal volume of the is reduced.

On the other hand, from the ink supply passage 8, the ink chamber 7
Since a pressurizing force is applied to the inside of each glass-like cylindrical tube 5a through the above, the reduced volume of ink inside each glass-like cylindrical tube 5a moves toward the orifice 6 and
When the ink particles are extruded from the outside, the ink particles extend in a columnar shape and are ejected or projected at a predetermined speed.

Then, after a certain amount of ink becomes columnar and is extruded for a predetermined length and amount, the voltage applied to the electrodes 3 and 4 arranged in the electrostrictive vibrator 2 is removed. By eliminating the electrostriction phenomenon of the electrostrictive vibrator 2,
The deformation that reduces the volume of the glass-like cylindrical tube 5a disappears, and the original state is restored.

Therefore, the ink existing around the orifice 6 moves toward the inside of the ink chamber 7. At this time, part of the ink in the columnar shape extending out of the orifice 6 is
It is left behind due to the speed going to the outside,
The ink particles 7 a are separated from the ink in the orifice 6.

The ink particles 7a separated from the columnar portion
Flies out of the inkjet head due to the velocity component toward the outside.

In the ink chamber 7, the ink volume is reduced by the volume of the ink particles 7a ejected to the outside, but the reduced amount of ink is replenished from the ink supply path 8 and the initial state can be restored. it can.

By repeating (applying to the selected electrodes 3 and 4) in the individual ink chambers of the heads of the inkjet head thus multi-processed, the glass-like tube forming the target glass cylindrical tube row 5 is formed. The cylindrical tube 5a can be selected to eject the ink particles 7a, which can be performed intermittently or continuously.

The electrostrictive vibrator 2 has been described using lead zirconate titanate, but a substance exhibiting an inverse piezoelectric effect, such as barium titanate (BaTiO3), may be used.

It is also possible to use a phenomenon other than the electrostriction phenomenon. For example, a layered magnetostrictive oscillator made of a material that causes a slight deformation (hereinafter referred to as a magnetostriction phenomenon) when magnetizing a ferromagnetic material, particularly a nickel, Alfa alloy, or other metal magnetostrictive material can be used. At the same time, it is also possible to use a vibrator in which ferrite powder is compression molded and sintered. When utilizing this magnetostriction phenomenon, means for applying a magnetic field from the outside is required.

Further, the glass-like cylindrical tube 5a forming the glass cylindrical tube row 5 has a hardness of about glass and is a metal cylindrical tube or a tube which is deformed to the same degree as glass by external pressing force. May be a cylindrical tube made of resin or the like, or the glass cylindrical tube row 5 may be a single plate provided with a large number of parallel holes.

The second embodiment according to the present invention is a single color single head as shown in FIG. That is, a part of the monochromatic multi-head shown in the first embodiment is made independent, one pressure generating portion 2a of the electrostrictive vibrator 2 is made independent, and it is brought into close contact with the end face of the pressure generating portion 2a. In this structure, the glass cylindrical tube row 5 is arranged. The other components and operations are substantially the same as those in the first embodiment, and thus the same reference numerals are given and the details thereof are omitted.

As shown in FIG. 5, the third embodiment of the present invention is a multicolor single head, and the main structure is substantially the same as that of the ink jet head of the first embodiment.
A predetermined number of colors, such as yellow, cyan, magenta,
A plurality of ink chambers 7 corresponding to black or the like are provided adjacent to each other.

In this case, the respective ink supply passages 8 communicating with the respective ink chambers 7 are provided so as to pass through the pedestals 10 standing upright on the back side, and the respective glass chamber tube rows 5 required in the respective ink chambers 7. It is the same as the previous embodiment in that the electrostrictive oscillator having the pressure generating portion is provided.

The fourth embodiment according to the present invention is a multicolor multihead, and as shown in FIG. 6, a plurality of rows of the single color multiheads of the first embodiment described above are arranged adjacent to each other. The array is, for example, a black array, a magenta array, a cyan array, and a yellow array, and this array can be arbitrarily selected.

FIG. 7 shows the fifth embodiment, in which the mounting positions of the electrodes 3 and 4 in the first embodiment are changed. That is, since the electrostrictive phenomenon generated by the electrostrictive oscillator 2 has a plurality of vibration modes, the electrodes 3 and 4 arranged on the upper and lower surfaces of the electrostrictive oscillator 2 shown in the first embodiment.
Is disposed on both side surfaces of the pressure generating portion 2a of the electrostrictive vibrator 2.

Furthermore, in the sixth embodiment, as shown in FIG. 8, the electrodes 3 and 4 of the fifth embodiment are made smaller, and the lower end of the pressure generating portion 2a of the electrostrictive oscillator 2, that is, the glass cylinder. In this structure, the electrodes 3 and 4 are arranged at positions close to the tube row 5.

The seventh embodiment according to the present invention is to accurately and rationally position the glass-like cylindrical tubes 5a constituting the glass cylindrical tube row 5, as shown in FIG. The pedestal 10 supporting the glass-like cylindrical tube 5a is provided with positioning protrusions 10b at appropriate intervals.

In this case, the positioning protrusions 10b are formed at a predetermined interval so as to be located at the substantially central portion of the gap 2b between the pressure generating portions 2a of the electrostrictive vibrator 2, and a predetermined number of the protrusions 10b are formed with respect to the pressure generating portions 2a. The glass-like cylindrical tube 5a is orderly positioned at a predetermined position, and the displacement due to the electrostrictive phenomenon caused by the electrostrictive oscillator 2 can be reliably transmitted to the glass-like cylindrical tube 5a.

In the eighth embodiment, as shown in FIG.
The portion where the glass cylindrical tube row 5 is arranged is a sawtooth portion 10c.
Then, the apex portion of the sawtooth-shaped portion 10c is positioned at a position approximately in the center of the interval 2b of the pressure generating portion 2a of the electrostrictive oscillator 2.
The tip surface of the pressure generating portion 2a is located at the valley of the sawtooth. Then, a plurality of glass-like cylindrical tubes 5a are arranged in the valleys of the sawtooth to ensure that the glass-like cylindrical tube 5a is displaced by the electrostrictive phenomenon generated from the comb-toothed portions 2a of the electrostrictive oscillator 2.
It is a structure that is transmitted to. In this case, the dummy tube does not occur.

In the ninth embodiment according to the present invention, as shown in FIG. 11, two electrostrictive vibrators 2 are arranged so as to sandwich the glass-like cylindrical tube 5a from above and below in a sandwich shape. This is a structure in which electrodes 3 and 4 are provided in each of the electrostrictive vibrators 2.

With this structure, the pressure transmission of the displacement due to the electrostriction phenomenon is applied not only from one side of the glass-like cylindrical tube 5a but also from both sides thereof, so that the glass-like cylindrical tube 5a can be efficiently transferred as a whole. The diameter can be reduced by 5a.

In any of the above examples 2 to 9,
The same operation as in the first embodiment is performed, and the ink particles ejected from the glass-like cylindrical tube adhere to, for example, the paper surface to draw a predetermined character or pattern.

[0050]

As described above, in the ink jet head according to the present invention, the pressure generating portion is formed on the electrostrictive vibrator or the magnetostrictive vibrator to which the electrode is attached, and the pressure of the pressure portion of the pressure generating portion is controlled. By arranging multiple cylindrical tubes that will be orifices in the receiving position in an adjacent state, there is no need for strict alignment between the electrostrictive vibrator or magnetostrictive vibrator and the cylindrical tube, so the assembly accuracy is strict. It is not required and has an extremely excellent effect of significantly reducing the manufacturing cost.

Since a plurality of necessary cylindrical tubes are arranged corresponding to the electrostrictive vibrator or the magnetostrictive vibrator,
This has an extremely excellent effect of simplifying the structure and facilitating the formation of the multi-head.

Furthermore, since heat is not used, ink that is weak to heat can be used, and the extremely excellent effect that the selection range of ink is greatly expanded is exhibited.

[Brief description of drawings]

FIG. 1 is an enlarged schematic plan view of a main part of an inkjet head according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view taken along the line AA of FIG.

FIG. 3 is a schematic perspective view of the ink jet head.

FIG. 4 is a schematic cross-sectional view of a single-color single head according to a second embodiment of the present invention.

FIG. 5 is a schematic plan view of a multicolor single head according to a second embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of the multicolor multihead according to the third embodiment of the present invention.

FIG. 7 is a schematic sectional view of an ink jet head according to a fourth embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of an ink jet head according to a fifth embodiment of the present invention.

FIG. 9 is a schematic sectional view of an inkjet head according to a seventh embodiment of the present invention.

FIG. 10 is a schematic sectional view of an inkjet head according to an eighth embodiment of the present invention.

FIG. 11 is a schematic sectional view showing an electrostrictive vibrator on both sides of a cylindrical tube of an inkjet head according to a ninth embodiment of the present invention.

FIG. 12 is a schematic cross-sectional view of a vibrator cylinder type ink jet head in the related art.

FIG. 13 is a schematic sectional view of the vibrator flat-plate type ink jet head.

FIG. 14 is a schematic cross-sectional view of the same stair type ink jet head.

FIG. 15 is a schematic cross-sectional view of the heating vaporization type ink jet head.

FIG. 16 is a schematic cross-sectional view of the heating vaporization type ink jet head.

FIG. 17 is a schematic cross-sectional view of the heating vaporization type ink jet head.

FIG. 18 is a schematic cross-sectional view of the heating vaporization type ink jet head.

[Explanation of symbols]

 2 Electrostrictive Oscillator 2a Pressure Generating Part 2b Gap 3 Electrode 4 Electrode 5 Glass Cylindrical Tube Row 5a Glass-like Cylindrical Tube 6 Orifice 7 Ink Chamber 7a Ink Particles 8 Ink Supply Channel 9 Side Plate 10 Pedestal 10a Groove 10b Positioning Protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Sato 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (21)

[Claims] 1. A pressure generating portion is formed by attaching electrodes to an electrostrictive oscillator or a magnetostrictive oscillator supported on a pedestal, and a plurality of cylindrical tubes are arranged at positions where pressure is applied by the pressure generating portion. An inkjet head characterized by. 2. The ink jet head according to claim 1, wherein the pressure generating portion is formed in a comb shape. 3. The plurality of cylindrical tubes to be arranged are characterized in that one end surface group is arranged in a line in the same plane and the other end surface group is arranged so as to face the ink chamber. Or 2
The inkjet head described in 1. 4. The ink jet head according to claim 1, wherein the electrostrictive vibrator is lead zirconate titanate. 5. The ink jet head according to claim 1, wherein the electrostrictive vibrator is barium titanate. 6. The ink jet head according to claim 1, wherein the magnetostrictive vibrator is a layered magnetostrictive vibrator. 7. The ink jet head according to claim 1, wherein the magnetostrictive vibrator is produced by compression molding ferrite powder and sintering the ferrite powder. 8. The inkjet head according to claim 1, wherein the cylindrical tube is a glass-like cylindrical tube. 9. The ink jet head according to claim 1, wherein the cylindrical tube is a metallic cylindrical tube. 10. The inkjet head according to claim 1, wherein the cylindrical tube is a resin cylindrical tube. 11. The ink jet head according to claim 1, 2 or 3, wherein the form of the head is a single color single head. 12. The ink jet head according to claim 1, 2 or 3, wherein the form of the head is a multicolor single head. 13. The inkjet head according to claim 1, wherein the form of the head is a multicolor multihead. 14. The inkjet head according to claim 1, wherein the attachment position of the electrode is provided on a side surface of the pressure generating portion of the electrostrictive oscillator or the magnetostrictive oscillator. 15. An electrode mounting position is provided on a side surface of a pressure generating portion of an electrostrictive oscillator or a magnetostrictive oscillator, and is provided at a position close to a cylindrical tube. Inkjet head. 16. The inkjet head according to claim 1, wherein the pedestal is provided with a protrusion for positioning a cylindrical tube. 17. The ink jet head according to claim 1, wherein a portion of the pedestal in which the cylindrical tube is arranged is serrated. 18. The inkjet head according to claim 1, wherein the ink supply path is provided on at least one of side plates provided on both sides of the base. 19. The inkjet head according to claim 1, wherein the ink supply path is provided on the back surface of the pedestal. 20. The ink jet head according to claim 1, wherein the ink supply path is provided on the lower surface of the pedestal. 21. An electrostrictive oscillator or a magnetostrictive oscillator is disposed on both sides of a cylindrical tube.
The inkjet head described in 1.